Centrifugal pump



Oct. 11, 1927.;

A. c. DURDIN, JR

CENTMFUGAL PUMP Filed Feb. '2. 1927 vn for:

Patented lOct. V11, 1927.

UNITED STATES N N 1,645,498 PATENT OFFICE.

aUeUsrUs c. DURDIN, Jn., Or cnrcaeo, ILLINOIS, AssIeNon v'ro cmcaeo ruinCOMPANY, Or CHICAGO, ILLINOIS, A CORPORATION Or ILLINOIs.

oaN'rmUGAL rUnr.

Application med February 7, 1927. Serial No. 166,390.

This invention relates to centrifugal pumps and more particularly to theimpel-` y1ers thereof, and its principal object is to simiplify andotherwise improve upon the construction upon such parts of centrifugalpumps. 'lhe invention concerns centrifugal pumps of the type used forejecting sewage or drainage water, or for ejecting liquids which containhard substances, trash, litter, blocks of wood, stone, semisolidmaterials and so forth, `which cannot be handled by the ordinarycentrifugal pump because of .the danger of injury tothe parts thereofand because of the danger of the pumpbecoming clogged. Another object ofthe present invent'ion is to increase the capacity: of centrifugal pumpsfof this type and to reduce toy a minimum the formation of eddies in thevolute part of thepump, which are of common occurrence and interferewiththe eili-y cientoperation ,of vthe pumps. lAnother ob.-

ller which may ject is to provide a centrifugal pump impelbe cast in onepiece and which does notreq'uilre the use of complicated sand cores inthe casting thereof. f

4With these ends in view, this invention consists in a centrifugal pumpimpeller hav ing a vane or Vanes of substantiall uniform thickness andcross section throug out their length, and each having a rounded,relatively wide forward end and formed with a reentrant part behind therounded forward end, whereby articles, 4having a eater length (withingiven limits) than the 'ameter of the eye of the impeller, may freelpass through the impeller and' be yeject from the pump. The inventionfurther consists in the several novel features yhereinafter fullyset'forth and claimed.

The inventionis clearly illustrated in the accompanying drawing, inwhich:

Fig. 1 is a front elevation of a centrifugal pump impeller embodyin asimple form] of the present invention ;l ig. 2' is a vertical sectionthereof taken on .a planel parallel with the front of the impeller seen1n Fig. 1;.Fig. 3 is a cross section taken on the line 3-3 ofFig. 1 andFig. 4 is a cross section taken on the line 4--4 of F 1.

Referring to said drawing, which illus tratesa simple embodiment of thepresent invention, the `reference .character 5 designates a vanesupporting member, here shown` in the form of a circular wall or plate,having on one side a hub 6 in which is secured vane isl of substantiallyuniform.' thickness Y and cross section throughout its entire length,although at the sides thereof where 1t "jolns the walls 5, 7, llets 10are formed between the vane and walls, which llets increase thethickness' somewhat at these places, but add strength and rigidity tothe whole structure-and prevent the gathering 'Il of trash and othermaterial in the corners between the vanesand walls.

Each vane is given a lform somewhat in -the nature of a volute orspiral, commencing at the forward end with a rounded art' 11, which ispreferably semicircular in orm and extendsfrom a point adjacent, butoutside of the eye 8 of the impeller tol a oint well within theInargn;orl periphery o the walls 5, 7. From the'semicircular forward end11, each vane extends in a curvilinear manner as at 12 toward theperipheries of ils 5, 7 where the part 13 of' the Outer face Of-the vaneis made concentric with the axis fof theim 11er` and coincides with ltheperipheries of t e walls. Said part 13 extends along the eriphery of theimpeller for' a considera le distance, in fact good results are obtainedwith the vane extendin along the periphery of the impeller throug an arcof sixty degrees or` thereabouts. At the rear or discharge end 14 theedge portion offeach vane may thin out to a.V relatively sharp edge ifdesired, the inner face of each vane being beveled vor curved outwardtoward the outer side as shown in gt will bexobserved that the curvedfor- 'ward ends 11 of the vanes are relatively i by making said forwardends ofl widely Y freely pass through the space between the vanes.Sticks, blocks `of wood, stones and So forthwhich are relatively long ascomared with their diameter are not likely to e caught between the vanesbut may ass .0n through the impeller thereby avoi. ing` the clo gin ofthe pump. It will h understood to those skilled in the art to which thisinvention pertains,

that a. pump case encloses the impeller and as usual said case takes avolute Y form.

around the impeller. Because of the paral-` lel relation of the innerand outer faces of the vanes,l and because a large part of thev rearends of said vanes are .concentric with the axis of rotation of the'impeller, the water in traveling through the pump may substantiallfollow said parallel lines, so that as the bodies of water on both sidesof each' vane come tovether at the rear end of each vane, but littledisturbance is created between the meeting bodies of water, since theyare flowing substantially in the same direction. The result is that'practically no eddies are created and the efficiency of the pump isthereby greatly increased. The curvature given to the vanes is suitablefor the purpose of impelling the water, together with the foreignsubstances contained therein, throu thereto, orce applied to the pump,thereby increasing the velocit of theiwater. Furthermore by reason o theshape and disposltion ofthe vanes, the entire lmpeller may be cast inone piece-without any core ockets in the vanes,` from which the san`cores must be removed. The impeller isofa form which may be easilymachined, is light, substantial and strong, and capable of longcontinued usage.

More or less variation of the exact details of construction is possiblewithout .departlng from the spirit of this invention. I desire,therefore, not to limit myself to the exact' form of the constructionshown and descrlbed, but intend, in the following claims, to point outall of the invention disclosed herein.

I claim as new, Letters Patent:

1. In a centrifugal pump impeller, a vane and desire to secure by ofuniform thickness throu hout, formed at its forward end with a U end toprovide a rounded and relatively wide impact end,

h the pump and of transmitting the remainder zof ythe vane beyond the Ubend extending in a curvilinear manner from v a point within and spacedaway from the circumference of the impeller to one on its periphery, andthence part way along the periphery on a concentric path.

2. In a centrifugal pump impeller, a vane of uniform thicknessthroughout, formed at` its forward end with a U bend to provlde a'yrounded and relatively wide impact end, the remainder of the vane beyondthe U bend extending in a curvilinear manner from' a point within andspaced awayy from theclrcumference of the impeller to one on itsperiphery and thence extending part way in a concentric path, along itsperiphery to its rear end.

3. In a centrifugal pump impeller, the

combination of a pair of parallel, circular vane supporting walls, and avane extending from wall to wall, said vane being of uniform thicknessthroughout and formed at its forward en'd with -a U bend to provide arounded and relatively wide impact end, thev remainder of said vaneextending in a curspaced away from the circumferenceof the impeller toone on its periphery, and thence part way along the periphery in aconcentricpath.

vilinear manner from a..point within and ios 5, In a centrifugal pumpimpeller, a vane of uniform thickne throughout and provided with aconvexly rounded forward end, the vane extending in a curvilinear mannerfrom a point within and spaced away from the circumference of theimpeller to one on its periphery, and thence part way along theperiphery on a concentric path.

6. In a centrifugal pump impeller, a vane of uniform thicknessthroughout and provided with a convexly rounded forward end, the vaneextendigig in a curvilinear manner from a point wi hln and spaced awayfrom the circumference of the impeller to one on its periphery andthence extending in a concentric manner along the eriphery of theimpeller to its rear end, t ere beings. reentrant portion on the innerside of the vane behind said convexly rounded forward end.

7. In a centrifugal pump impeller a vane provided with a convexlyrounded forward part located within and spaced away from the periphe ofthe impeller,l and having a part of uni omi thickness, extending fromysaid conveXl rounded forward part to the periphery o the impeller in acurvilinear manner, and thence part way along'l :the periphery on aconcentric path. f

8. In a centrifugal pump impeller, ya vane provided with a convexlyrounded forward part located within and s aced away Afrom the peripheryof the impe er, andhaving a part of uniform thickness, extending fromsaid convezrly rounded forward part tothe periphery of the impeller in acurvilinear manner and thence in a 'concentric manner toits rear end. l

9. In .a centrifugal pump impeller, the combination of a circular vane`supporting wall. and a vane supported thereby and pro vided with aconvexly rounded forward part and having a. part located within and saced 20 away from the` periphery' of the impel er of` uniform thickness,extending from said con` vexly .rounded forward part to the periphery ofthe impellerl in a curvilinear manner, and thence part way along theperiphery on a concentric patin 10. In a centrifugal combination of acircular vane sup ortin wall and a pair of varies supported 1y sai wall.and each provided with a` convex y forward part and having a partlocated within and spaced away from the periphery of the impeller ofuniform tlnc mess extending from said convexly rounded forward part tothe periphery of the impeller in a curvilinear manner and thencein aconcentric manner along the periphery of the impeller.

AUGUSTUS C. EURDIU9 Jn.

purnp impeller, the y

